Month: October 2015

A while ago we experienced an issue with slow backup performance on an Azure VM. In light of the experience we had on that case, I went into my lab environment to test the impact of different parameters…

Now we’ll add a fixed block size and max transfer size. Be aware that the blocksize is 65k for tape devices and 512 for anything else. So we’ll beefed that up and got a bit less than double from where we started.

I ran the “increase” script a few more time to have a database from about 5.2GB. The performance is better than the two other smaller ones.

Conclusion

Parameters : Choosing your parameters matters A LOT. We had a case that went from 9MB/s to 90MB/s by using the same set of parameters as above…

Database Size : There is a ramp up time involved… Small databases experience a penalty due to this.

Design : Be aware of your disk subsystem design. Using one standard disk will provide you with 500 IOPS/s. If you use this disk for both source & target, then you don’t need to be a professor to know that this won’t yield a big performance.

Up in the Clouds

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